(function ($) {
    $.fn.extend({
                    smartpaginator: function (options) {
                        var settings = $.extend({
                                                    totalrecords: 0,
                                                    recordsperpage: 0,
                                                    length: 10,
                                                    next: 'Next',
                                                    prev: 'Prev',
                                                    first: 'First',
                                                    last: 'Last',
                                                    go: 'Go',
                                                    theme: 'green',
                                                    display: 'double',
                                                    initval: 1,
                                                    datacontainer: '', //data container id
                                                    dataelement: '', //children elements to be filtered e.g. tr or div
                                                    onchange: null,
                                                    controlsalways: false
                                                }, options);
                        return this.each(function () {
                            var currentPage = 0;
                            var startPage = 0;
                            var totalpages = parseInt(settings.totalrecords / settings.recordsperpage);
                            if (settings.totalrecords % settings.recordsperpage > 0) totalpages++;
                            var initialized = false;
                            var container = $(this).addClass('pager').addClass(settings.theme);
                            container.find('ul').remove();
                            container.find('div').remove();
                            container.find('span').remove();
                            var dataContainer;
                            var dataElements;
                            if (settings.datacontainer != '') {
                                dataContainer = $('#' + settings.datacontainer);
                                dataElements = $('' + settings.dataelement + '', dataContainer);
                            }
                            var list = $('<ul/>');
                            var btnPrev = $('<div/>').text(settings.prev).click(function () { if ($(this).hasClass('disabled')) return false; currentPage = parseInt(list.find('li a.active').text()) - 1; navigate(--currentPage); }).addClass('btn');
                            var btnNext = $('<div/>').text(settings.next).click(function () { if ($(this).hasClass('disabled')) return false; currentPage = parseInt(list.find('li a.active').text()); navigate(currentPage); }).addClass('btn');
                            var btnFirst = $('<div/>').text(settings.first).click(function () { if ($(this).hasClass('disabled')) return false; currentPage = 0; navigate(0); }).addClass('btn');
                            var btnLast = $('<div/>').text(settings.last).click(function () { if ($(this).hasClass('disabled')) return false; currentPage = totalpages - 1; navigate(currentPage); }).addClass('btn');
                            var inputPage = $('<input/>').attr('type', 'text').keydown(function (e) {
                                if (isTextSelected(inputPage)) inputPage.val('');
                                if (e.which >= 48 && e.which < 58) {
                                    var value = parseInt(inputPage.val() + (e.which - 48));
                                    if (!(value > 0 && value <= totalpages)) e.preventDefault();
                                } else if (!(e.which == 8 || e.which == 46)) e.preventDefault();
                            });
                            var btnGo = $('<input/>').attr('type', 'button').attr('value', settings.go).addClass('btn').click(function () { if (inputPage.val() == '') return false; else { currentPage = parseInt(inputPage.val()) - 1; navigate(currentPage); } });
                            container.append(btnFirst).append(btnPrev).append(list).append(btnNext).append(btnLast).append($('<div/>').addClass('short').append(inputPage).append(btnGo));
                            if (settings.display == 'single') {
                                btnGo.css('display', 'none');
                                inputPage.css('display', 'none');
                            }
                            buildNavigation(startPage);
                            if (settings.initval == 0) settings.initval = 1;
                            currentPage = settings.initval - 1;
                            navigate(currentPage);
                            initialized = true;
                            function showLabels(pageIndex) {
                                container.find('span').remove();
                                var upper = (pageIndex + 1) * settings.recordsperpage;
                                if (upper > settings.totalrecords) upper = settings.totalrecords;
                                container.append($('<span/>').append($('<b/>').text(pageIndex * settings.recordsperpage + 1)))
                                    .append($('<span/>').text('-'))
                                    .append($('<span/>').append($('<b/>').text(upper)))
                                    .append($('<span/>').text('of'))
                                    .append($('<span/>').append($('<b/>').text(settings.totalrecords)));
                            }
                            function buildNavigation(startPage) {
                                list.find('li').remove();
                                if (settings.totalrecords <= settings.recordsperpage) return;
                                for (var i = startPage; i < startPage + settings.length; i++) {
                                    if (i == totalpages) break;
                                    list.append($('<li/>')
                                                    .append($('<a>').attr('id', (i + 1)).addClass(settings.theme).addClass('normal')
                                                                .attr('href', 'javascript:void(0)')
                                                                .text(i + 1))
                                                    .click(function () {
                                                               currentPage = startPage + $(this).closest('li').prevAll().length;
                                                               navigate(currentPage);
                                                           }));
                                }
                                showLabels(startPage);
                                inputPage.val((startPage + 1));
                                list.find('li a').addClass(settings.theme).removeClass('active');
                                list.find('li:eq(0) a').addClass(settings.theme).addClass('active');
                                //set width of paginator
                                var sW = list.find('li:eq(0) a').outerWidth() + (parseInt(list.find('li:eq(0)').css('margin-left')) * 2);
                                var width = sW * list.find('li').length;
                                list.css({ width: width });
                                showRequiredButtons(startPage);
                            }
                            function navigate(topage) {
                                //make sure the page in between min and max page count
                                var index = topage;
                                var mid = settings.length / 2;
                                if (settings.length % 2 > 0) mid = (settings.length + 1) / 2;
                                var startIndex = 0;
                                if (topage >= 0 && topage < totalpages) {
                                    if (topage >= mid) {
                                        if (totalpages - topage > mid)
                                            startIndex = topage - (mid - 1);
                                        else if (totalpages > settings.length)
                                            startIndex = totalpages - settings.length;
                                    }
                                    buildNavigation(startIndex); showLabels(currentPage);
                                    list.find('li a').removeClass('active');
                                    inputPage.val(currentPage + 1);
                                    list.find('li a[id="' + (index + 1) + '"]').addClass('active');
                                    var recordStartIndex = currentPage * settings.recordsperpage;
                                    var recordsEndIndex = recordStartIndex + settings.recordsperpage;
                                    if (recordsEndIndex > settings.totalrecords)
                                        recordsEndIndex = settings.totalrecords % recordsEndIndex;
                                    if (initialized) {
                                        if (settings.onchange != null) {
                                            settings.onchange((currentPage + 1), recordStartIndex, recordsEndIndex);
                                        }
                                    }
                                    if (dataContainer != null) {
                                        if (dataContainer.length > 0) {
                                            //hide all elements first
                                            dataElements.css('display', 'none');
                                            //display elements that need to be displayed
                                            if ($(dataElements[0]).find('th').length > 0) { //if there is a header, keep it visible always
                                                $(dataElements[0]).css('display', '');
                                                recordStartIndex++;
                                                recordsEndIndex++;
                                            }
                                            for (var i = recordStartIndex; i < recordsEndIndex; i++)
                                                $(dataElements[i]).css('display', '');
                                        }
                                    }

                                    showRequiredButtons();
                                }
                            }
                            function showRequiredButtons() {
                                if (totalpages > settings.length) {
                                    if (currentPage > 0) {
                                        if (!settings.controlsalways) {
                                            btnPrev.css('display', '');
                                        }
                                        else {
                                            btnPrev.css('display', '').removeClass('disabled');
                                        }
                                    }
                                    else {
                                        if (!settings.controlsalways) {
                                            btnPrev.css('display', 'none');
                                        }
                                        else {
                                            btnPrev.css('display', '').addClass('disabled');
                                        }
                                    }
                                    if (currentPage > settings.length / 2 - 1) {
                                        if (!settings.controlsalways) {
                                            btnFirst.css('display', '');
                                        }
                                        else {
                                            btnFirst.css('display', '').removeClass('disabled');
                                        }
                                    }
                                    else {
                                        if (!settings.controlsalways) {
                                            btnFirst.css('display', 'none');
                                        }
                                        else {
                                            btnFirst.css('display', '').addClass('disabled');
                                        }
                                    }

                                    if (currentPage == totalpages - 1) {
                                        if (!settings.controlsalways) {
                                            btnNext.css('display', 'none');
                                        }
                                        else {
                                            btnNext.css('display', '').addClass('disabled');
                                        }
                                    }
                                    else {
                                        if (!settings.controlsalways) {
                                            btnNext.css('display', '');
                                        }
                                        else {
                                            btnNext.css('display', '').removeClass('disabled');
                                        }
                                    }
                                    if (totalpages > settings.length && currentPage < (totalpages - (settings.length / 2)) - 1) {
                                        if (!settings.controlsalways) {
                                            btnLast.css('display', '');
                                        }
                                        else {
                                            btnLast.css('display', '').removeClass('disabled');
                                        }
                                    }
                                    else {
                                        if (!settings.controlsalways) {
                                            btnLast.css('display', 'none');
                                        }
                                        else {
                                            btnLast.css('display', '').addClass('disabled');
                                        }
                                    };
                                }
                                else {
                                    if (!settings.controlsalways) {
                                        btnFirst.css('display', 'none');
                                        btnPrev.css('display', 'none');
                                        btnNext.css('display', 'none');
                                        btnLast.css('display', 'none');
                                    }
                                    else {
                                        btnFirst.css('display', '').addClass('disabled');
                                        btnPrev.css('display', '').addClass('disabled');
                                        btnNext.css('display', '').addClass('disabled');
                                        btnLast.css('display', '').addClass('disabled');
                                    }
                                }
                            }
                            function isTextSelected(el) {
                                var startPos = el.get(0).selectionStart;
                                var endPos = el.get(0).selectionEnd;
                                var doc = document.selection;
                                if (doc && doc.createRange().text.length != 0) {
                                    return true;
                                } else if (!doc && el.val().substring(startPos, endPos).length != 0) {
                                    return true;
                                }
                                return false;
                            }
                        });
                    }
                });
})(jQuery);